From b7a2e993b61a6f587bc4d6bb980f9c9de20cd962 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Fri, 29 Sep 2017 12:49:10 +0100
Subject: [PATCH] Fix crash in traffic code

Hit an exception where no runway node was found creating the landing taxi.
Probably should not happen but anyway let's not crash
---
 src/AIModel/AIFlightPlanCreate.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AIModel/AIFlightPlanCreate.cxx b/src/AIModel/AIFlightPlanCreate.cxx
index f36c11a7d..7a8fd7b45 100644
--- a/src/AIModel/AIFlightPlanCreate.cxx
+++ b/src/AIModel/AIFlightPlanCreate.cxx
@@ -409,7 +409,7 @@ bool FGAIFlightPlan::createLandingTaxi(FGAIAircraft * ac, FGAirport * apt,
     // fallback mechanism for this. 
     // Starting from gate 0 doesn't work, so don't try it
     FGTaxiRoute taxiRoute;
-    if (gate.isValid())
+    if (runwayNode && gate.isValid())
         taxiRoute = gn->findShortestRoute(runwayNode, gate.parking());
 
     if (taxiRoute.empty()) {